Everyday, Culture & Nature Age Tools
Everything that isn't about health, sport, children or money: exact ages between dates, ages counted in other calendars, pets' life stages, trees and plants, and light-hearted tallies of your habits. Pet pages lead with the animal's actual age and life stage; any "human years" figure is labelled as a comparison.
Calendar tools show their supported date range and which regional convention they follow. Trunk and shell size never give an exact age. Checklists and tallies are for reflection or fun, not a measure of maturity.
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Chronological Age Calculator
Calculate your exact age in years, months, and days from your date of birth
Dog Age Calculator
Convert dog years to human years using a modern size-adjusted formula with life stage and expectancy
Lunar Age Calculator
Chinese traditional age and zodiac by actual Lunar New Year dates
Planet Age Calculator
Find out how old you are on Mars, Jupiter, Saturn, Mercury, Venus, Uranus, and Neptune
Exact age & dates
Age to the day, the gap between two birthdays, anniversaries, and your age in orbits of other planets.
Chronological Age Calculator
Calculate your exact age in years, months, and days from your date of birth
Age Difference Calculator
Find the exact age gap between two people in years, months, and days
Wedding Anniversary Calculator
Find your anniversary year and discover traditional, modern, gemstone, and flower gift ideas
Planet Age Calculator
Find out how old you are on Mars, Jupiter, Saturn, Mercury, Venus, Uranus, and Neptune
Cultural & calendar ages
Traditional counts alongside the legal age: Chinese lunar, Korean, Japanese era years and the Umm al-Qura Hijri calendar.
Lunar Age Calculator
Chinese traditional age and zodiac by actual Lunar New Year dates
Korean Age Calculator
Traditional, counting and international Korean age
Japanese Age Calculator
Man-nenrei, kazoe-doshi and Japanese era year
Islamic Age Calculator
Hijri age and birth date using the Umm al-Qura calendar
Dogs, cats & comparing pets
Life stage by size for dogs, AAHA/AAFP stages for cats, and a side-by-side comparison page.
Small mammals
Rabbits, rodents, ferrets and hedgehogs, which age far faster than dogs or cats.
Rabbit Age Calculator
Convert rabbit years to human years with life stage ranges and expectancy estimates
Hamster Age Calculator
Convert hamster age to human years with life stage and expectancy (Syrian and dwarf hamsters)
Guinea Pig Age Calculator
Convert guinea pig (cavy) years to human years with life stage and expectancy
Ferret Age Calculator
Convert ferret years to human years with life stage and life expectancy estimates
Hedgehog Age Calculator
Convert hedgehog age to human years with life stage and expectancy for African pygmy hedgehogs
Chinchilla Age Calculator
Convert chinchilla age to human years with life stage and life expectancy estimates
Reptiles, birds, fish & horses
Species with very different lifespans; shell or body size is a rough guide only.
Turtle Age Calculator
Estimate your turtle or tortoise's age from shell length and species growth profile
Snake Age Calculator
Convert snake years to human years by species (ball python, corn snake, king snake, boa, milk snake)
Lizard Age Calculator
Convert lizard age to human years by species — gecko, skink, iguana, anole, monitor, and more
Bearded Dragon Age Calculator
Convert bearded dragon age to human years with life stage and life expectancy for pet reptiles
Bird Age Calculator
Convert bird years to human years by species (parrot, macaw, cockatiel, canary) with life stage and expectancy
Fish Age Calculator
Convert fish years to human years by species (goldfish, betta, guppy, tetra, koi, angelfish)
Horse Age Calculator
Convert horse years to human years by breed type (pony, light horse, warmblood, draft)
Trees & plants
Species growth factors for trees from trunk size, and houseplant age.
Relationships & life planning
The half-your-age-plus-seven folk rule and reflection checklists for marriage, parenthood and social connection — no pass marks.
Half Your Age Plus Seven Calculator
Works out the folk 'half your age plus seven' rule for adults — not a legal or compatibility test
Marriage Readiness Reflection Checklist
Eight conversation topics couples often cover before marrying — a self-reflection count, no ideal age
Parenthood Planning Reflection Checklist
Eight practical topics to think through before becoming a parent — reflection only, not medical advice
Social Connection Reflection
Six self-reflection statements about support, contact and community — no social age, not a diagnosis
Habits & lifetime tallies
Plain totals from your own numbers: countries visited, miles driven, cups of coffee, hours online, gaming and reading.
Travel Tally Calculator
Countries and continents visited as a share of 195 countries and 7 continents
Lifetime Driving Distance Calculator
Total miles/km driven and laps of the Earth from yearly distance
Lifetime Coffee Calculator
Lifetime cups and daily caffeine range from cups per day and years
Lifetime Internet Time Calculator
Total hours and days spent online from daily hours and years
Gaming Age Calculator
Discover your gaming age based on hours played, reflexes, genres, competitive level, and platform
Reading Habits Age Calculator
Estimate your literary maturity from reading volume, genre diversity, format preferences, and book community engagement
Book Reader Age Calculator
Estimate lifetime books read, total pages, and your reader maturity tier