does anyone think that ward and june look a bit older than what typical parents would be with 2 kids the age of wally and beaver ?
People looked older in the 1950s than they do now. I've watched old episodes of "You Bet Your Life" where Groucho would ask a woman how old she was. She'd say 25 and she looked about 45 to me.
In 1957, when Beaver was supposedly 7 (although Jerry Mathers was actually 9) and Wally 12 (his true age) -- and by the way, that means Wally should have been in 7th grade, not 8th, which would have worked out better later in the series -- Hugh Beaumont was 48 and Barbara Billingsley was 42. That means they were 36 and 30 when Wally was born -- so, yes, I'd say they were older than the average parents of kids that age.
Getting back to Wally being in 8th grade the first season -- that means in the last season, he should have been in his first year of college, but he was still in his senior year of high school. It wasn't mentioned -- obviously, such a good student didn't flunk and have to repeat the year! I guess they didn't want him going to college in town and still live at home -- he's the type to go to a state college on an athletic scholarship -- so they just quietly kept him in high school for one more year. If they had correctly put him in 7th grade the first season, it would have worked out perfectly.
But what's odder is that the last season should have had Beaver in 7th grade, but I think he was in 8th. That implies he skipped a grade, which sure doesn't ring true for a kid who wasn't known for his brains.
On a personal note, in 1957 my older brother and I were the exact ages of Beaver and Wally, 7 and 12. Our resemblance to the Cleaver family begins and ends there (although I did have a tendency to be led astray by some troublemaking so-called friends and a couple of truly awful cousins that made Eddie Haskell look like an angel in comparison.)