Let us solve it by trial and error
1 scenario father´s age = 63 son´s age = 36
one year ago father was 62 and son 35 ratio = 62 / 35 = 1,77
2 scenario father´s age = 53 son´s age = 35
one year ago father was 52 and son 34 ratio = 52 / 34 = 1,53
3 scenario father´s age = 73 son´s age = 37
one year ago father was 72 and son was 36 ratio = 72 / 36 = 2
Current ages are 73 and 37