Here you can find exacly how old these characters are, for now I've only got Bulma and Vegeta but I'll try to get those of others'.
Vegeta:
Born Dragonball year: 732 AD
762 AD: Vegeta lands on Earth and is 30 years old
766 AD: Trunks is born and Vegeta is 34 years old
All this time Vegeta is one year older than Bulma but while he trains in the room of spirit and time twice, 2 years pass by in 2 days so he is now 3 years older than Bulma.
778 AD: Bra is born and Vegeta is 49 years old
784 AD: series ends, Vegeta is 55 years old
Bulma:
All the time 1 year younger than Vegeta so you can do the math on your own but I'll just do it for you
Born Dragonball year: 733 AD
762 AD: 29 years old
766 AD: she gives birth to Trunks at an age of 33
778 AD: she has Bra and is 46 years old
784 AD: the series ends while she's at 52 years
Rewind