Will Boruto have a Timeskip?

well for people who didn’t, yes boruto will have a timeskip in which kawaki and boruto look hella cool. in the timeskip kawaki will probably control karma and boruto master jougan and karma.

How old is Boruto going to be after the Timeskip?

With the time skip, during the events of Boruto, he is likely 33 years old.