Do we know Al Bundy's age in the show? I tried googling but to no avail.
According to a wiki about the show he was "Class of 1966" (wikipedia mentions him scoring 4 touchdowns in one football game in 1966) which would mean he was born c. 1948, so the first season he would be approximately 39.
They also celebrated their 16th wedding anniversary in the first season, which puts him at around 23 for the wedding, which was bog-standard marriage age in my neighborhood c. 1970.
This is complicated a little because he claims at one point (S11E12) to have signed his dad up for the Korean War, which was 1950-1953.