I'm going to go with a cautious "yes" to the first: the ages at death of https://en.wikipedia.org/wiki/List_of_English_monarchs are not great.
"No" on the second (king is never going to have to worry about food security, that's for the peasants)
And "life opportunties" .. bit of a divide by zero situation. As king, you technically have all the opportunities. But you can only do things which actually exist at the time. And you're bound by the social and religious conventions of the time, which you mess with at your peril. Doing so worked for Henry VIII but not for the various Georges. See, for example, the controversy over whether James 6 might have been gay.