I'd think the details of the route would be more a determining factor than the length of the commute. As long as the biking route is safe - that should be an hour commute or less each way. How long will it actually be by car vs bike? Might be worth some comparisons.
Just for fun - I'll be 60 in a couple months and my commute is about 13kms and takes about 20 minutes. Since there's a dedicated bike route - its actually faster than by car.
But congrats on the new job - whatever the final commuting decision.