It is nice how they de-aged Ben and May over the years so there wasn't SUCH a huge gap between Richard and Ben in the age department. Richard looks like his mid-to-late 30s when he died so Ben shouldn't have been more then his early 50s when he died.
Then again, the only reason May had a wrinkled face was because of how comics were printed back then. If they didn't give her such a wrinkled face you'd never know she was meant to be old. These days they can give her an aged appearance without making her look like a cadaver.