I think it will be open ended. It’s better to be able to continue the adventures of young Solo.
How old was Han Solo in ANH?
29/30
Yep, although in general Star Wars is vague with character ages and timeframes. I actually don’t even know where this number comes from but it seems to be generally agreed upon.
They might change his age in the new canon to be closer to Ford’s real age in the OT. Then again, both Obi-Wan and Mon Mothma has aged pretty weirdly in the current canon, so they might not bother to alter anything.