These are the ages: (carachter at the beginning of db is the first age: at the begining of dbz is the second age and at the begining of dbgt is the third age)

Character
Beginning
of DB
Beginning
of DBZ
Beginning of
DBGT
Android #16
N/A
N/A
22
Android #17
N/A
N/A
22
Android #18
N/A
N/A
22
Baba
519
531
559
Bulma
16
28
56
Ch-Chi
12
24
52
Freiza
34
46
74
Gohan
N/A
4
32
Goku
12
24
52
Goten
N/A
N/A
22
Grandpa Gohan
91
N/A
N/A
Kami
507
519
fused with piccolo
Krillen
13
25
53
Oolong
9
21
49
Pan
N/A
N/A
10
Piccilo
N/A
12
40
Pilaf
34
46
N/A
Roshi
319
331
359
Tien
16
28
56
Trunks
N/A
N/A
23
Vegeta
17
29
56
Videl
N/A
3
31
Yamcha
16
28
56