all i do know is that I consider myself in somewhat good shape
This seems like a good time to bring this up. I would like to preface this by saying this is not a personal attack against anyone or what they find important. I love running too, and if push comes to shove, I'd choose those 5 mile trail runs for the rest of my life if I HAD to choose.
The vast majority of people, even those that might workout regularly and consider themselves fit, would not truly be classified as FIT. There's a spectrum, or what I call the Health Arch: SICKNESS----------WELLNESS----------FITNESS. Unfortunately with American obesity rates, the majority of Americans fall on the SICKNESS end of the arch. BAD blood pressure, resting heart rate, cholesterol, body fat, etc. At the top of the arch you have WELLNESS, which includes ACCEPTABLE blood pressure, resting heart rate, cholesterol, and body fat. Some individuals who exercise occasionally, or even regularly, will fall into this category. True FITNESS includes ACCEPTABLE/EXCELLENT blood pressure, resting heart rate, cholesterol, and body fat, as well as competency in these ten areas of FITNESS: Accuracy, Agility, Balance, Cardio Respiratory Endurance, Coordination, Flexibility, Power, Speed, Strength, Stamina.
Being WELL is better than being SICK. But from experience, being truly FIT is what brings supreme confidence. Improving all those aspects through functional movement is what gives me the feeling that there is absolutely NO physical task or challenge that I find intimidating. Life becomes easy on that end of the Health Arch.
edit: Oh yeah, the point! Don't neglect anything. Do it all, your body will thank you for it. And that doesn't mean pick up the strength lifting or whatever from the crazy hard workout DVDs. It's cool if you've done them in the past, or if you've got goals to do them in the future. Bad starting point though. Age is ultimately irrelevant if you're doing the right things and progressing in a systematic fashion. I had an 84 yr old client that did as much or more work as any other client I had, and that included strength work.