What is the average time for a 45 yr old 50m freestyle?

well... that depends on how long that 45 yr old has been swimming. It also depends on whether the swimmer is female or male
my dad is 45 and he can easily go 28 seconds for 50 free
my mom is 45 and she can go a 33 for 50 free
however, both of my parents swan as kids.
if you have not swam as a child the average time for a man would be about 37 seconds. the average time for a woman would be 42 seconds