I'm about your age and have been lifting in addition to cycling and running for about 2 1/2 years now. Just accept that at our age you aren't going to see gains as easily or quickly as when we were younger. Nor will you see the same gains as someone the same age who has been working out consistently since they were younger.
But even in your 40's you can and will see gains. I would suggest that you up your protein intake, some say to strive for 1g per pound of body weight daily. Then just be patient, consistent work is what will get you there, not shortcuts.
Finally, note that in today's society most of what is perceived as being muscular is the result of being really, really (and I mean REALLY) lean. In that respect cycling can help, although as some have mentioned 6-hour rides and the like may be counterproductive. I try to keep my rides and runs short and intense, as that will help lean you out without taking away from your muscle mass.
Last edited by MCODave; 06-15-16 at 10:13 AM.