Two Items

The skills are always there, the ability to carry them out may wain.  Two things you need to do:

1.  Attitude is key.  If you think you are a old fart, you are an old fart.  
2. Better living through chemistry. Hit thee to thy doctor, and be frank.  Let him or her know what is happening or not happening with the plumbing.  If your doctor doesn't seem to care, get another doctor.  Sex is part of life, and without it, we are not whole.  

Somebody who understands your motor needs some warm up time and is affectionate, caring and understanding of your needs and desires and doesn't put any pressure on you to rush or to have a stellar performance.  (if you do great but if not, you shouldn't be made to feel like its a let down either).

testosterone levels. They decline naturally with age. 1shot every 2 weeks can make a world of difference.

not drink any alcohol for the 1-2 days before a date.  This is the main reason I like to have it set up in advance, so I know when I need to abstain.

Swim

Chemistry & Consistency!

Practice with a lover whom sparks fly!

Vitamin D, ginseng tea and goji berries.

I've been on these for about three years, and I think they have kept this almost 60 year old on an even keel.

Don't underestimate exercise and rest, and keeping your weight and blood pressure in line.

Stay hydrated too.  We let our organs rot from not enough water.  Four glasses a day, minimum.

skills

simple..use it or lose it..at age 60 or above this is even more important..the more often you use it..the better you feel..and the better you feel about yourself..

and imagination.....yours and hers!!!

I don't know if you are overweight but too much weight and no exercise plus eating a lot of fatty foods are real problems when it comes to enjoying sex, or sleeping good, or feeling good, or even feeling good about yourself. I know this because I took control of myself 2 years ago and feel like a guy 20 years younger. No BS. Its hard work but I now run 2 to 3 miles 3 times a week,  workout with weights, lost 65 lbs.,. Last checkup was awsome. Anyway, you might try these things couldn't hurt and it most assuredly will help. If nothing else you will gain self confidence and stamina. Plus live longer.

lost over 30 lbs. in the last 3 years and dropped several pants sizes. I spend more time at the gym and more importantly, more time reading labels on food containers. For me, it has been about portion control in addition to the new exercise regime I have been following. I also get 7-8 hours of sleep each night and stay hydrated by drinking lots of water.