Is it because of my age? Do I have hopes of getting down to a C#2,C2 or even hopefully a B1 as I get older?
In short, it is likely you will be able extend your lower range to an extent.
Certain vocal exercises will help with range on the higher and lower spectrum of your voice and while you are able to extend that range to a point, the lower range is trickier. The reason has to do with the physiology of your body, mainly your larynx (voice box, adam's apple) and vocal folds.
This website and this website help explain the anatomy of your larynx. The reason why you can sing in head voice or falsetto is because you are able to manipulate your vocal folds, specifically by lengthening or tightening the folds that raises the pitch. In contrast relaxing the vocal folds and cause them to vibrate slower causes the lower pitch. You can see why it's easier to extend the higher range because you have more to stretch, rather than a lower range because there is only so much you can relax, so to speak.
With this being said as you age, or learn to fully manipulate the folds to vibrate at a slower rate you will be able to lower the pitch. Anatomically speaking if the folds grow in size that will have an affect on range. Many older men in my choir as they age lower their range, not all, but many. Though much of this is what you are born with the more you practice in a healthy way to lower the range it will lower to an extent.