I have come up with the following simple sentence:
If I had been younger I would have had less wrinkles.
It bears the past tense in it and I as understand it is perfectly correct. But if I make it a bit more complex I'm not sure what tense I should use for the 2nd, 3rd etc. verbs in such sentences. For example, lets change the said sentence to this:
If I had been younger and exercised more I would have had less wrinkles and could run a marathon.
Is that sentence correct? The thing that bothering me, whether it is correct to use just "exercised" & "could" and not "had exercised" & "could have".