Great gains in a short time, Black&Tan. At 36, don't be concerned with how fast you can build up. I'm 32 and have been lifting since I was 13. After numerous injuries I can safely recommend not to get caught up so much in the numbers.
In November 2011 I got in to running, which is a big change for a slow-moving lifter. I'm not lifting much at all at the moment and focusing on running and body-weight movements such as pushups and pullups and mixing pushups into my runs.
5K rail train run + ~200 pushups in 33:08.
0:00 pushups, then walk/jog
2:00 pushups, then walk/jog
2006 sonic blue zx5 GT2871r turbo.