This question is about crew ages on trading voyages in the North Pacific around 1810. The number of crew members on these voyages was often in the low dozens. Funding could come at least in part from captains like Barkley, Dobell, or Gyzelaar, but often the backer was a corporation like the East India Company, the Russian-American Company, Bryant & Sturgis, or the North West Company. Let's disregard the unique case of the Manila Galleon system, which wound down around this time.
It goes without saying that the captains preferred to hire skilled, reliable, affordable candidates for their crew. The skill and reliance criteria could rule out very old and very young applicants (but note the role of cabin boy).
Local conditions affected crew age distribution. A sponsored mission of exploration could hire a whole cohort of sailors in the prime of life, while a frontier transport beset by scurvy might be forced to hire whatever manpower was available in some remote port. All else equal, a vessel with a larger crew would tend to have a slightly larger spread of ages. Every crew had one youngest and one oldest sailor.
Typically, how old were the youngest and oldest sailors aboard?
Probably this question can only be answered obliquely, so I'm open to extrapolations based on other places and times.