When considering supplements, it's always worthwhile to look at science, and there is at least one study that tested the effect of creatine on us olds doing strength training:

Strategic creatine supplementation and resistance training in healthy older adults

Highlights:

• Creatine supplementation before exercise increased leg press strength by average of 31 kg vs. placebo
• Creating supplementation after exercise increased leg press strength by average of 35 kg vs. placebo

Summary:

"Compared with resistance training alone, creatine supplementation improves muscle strength, with greater gains in lean tissue mass resulting from post-exercise creatine supplementation."

Not too shabby.