Verified Answer :

Joe is 2 years old.

7-3=4

4/2=2

2*2=4

4+3=7

let x= Joe's age
2x+3= Aiden's age

Aiden is 7

2x+3=7
subtract 3 from both sides
2x=4
divide by 2
x=2

Joe is 2yrs old

hope this helps