Answer:
Bonjour!
This would be different for everyone.
So what I can help you with is the numbers and wording of the sentences:
the structure is the following:
(subject) + a + (age) + an(s)
It's basically, someone + is + that many + years old.
So:
Moi, j'ai
Mon père a
Ma mère a
Mon meilleur ami a
Ma meilleur amie a
Mon oncle préféré a
Ma cousine préférée a
Le professeur a
and then a number for the age:
1 - un
2 - deux
3 - trois
4 - quatre
5 - cinq
6 - six
7 - sept
8 - huit
9 - neuf
10 - dix
11 - onze
12 - douze
13 - treize
14 - quatorze
15 - quinze
16 - seize
and then you just need to know the 10s:
20 - vingt
30 - trente
40 - quarante
50 - cinquante
60 - soixante
70 - soixante-dix
80 - quatre-vingt
90 - quatre-vingt-dix
100 - cent
then, it's very simple:
for example to make 45, you would simply put 40 + 5:
quarante cinq
it's like this for every other possibility except for the first numbers of each 10s:
so 21 would be 20 and 1, not 20 + 1:
vingt et un
61 would be 60 and 1, not 60 + 1:
soixante et un
After the number you need to add ans, which means years.
The only exception being for 1, where you would loose the s to give an.
I hope this will help :)