I (39M) am no longer attracted to my wife (37F), How do I fix this?

Hello, my wife (37F) and I (39M) have been married for 14 years now and we have a 10 year old daughter. My wife is a kind, wonderful, supporting and just about the best partner a man can ask for. I cannot imagine spending a single day of my life without her. I love her to death, the issue however is physical. I can no longer get aroused by her, I initially thought it was due to my porn watching so I stopped watching porn and while it did help a little but it didn't fix it. I also started to exercise thinking perhaps it was related to my health and though I have lost 25 lbs over last 18 months or so and feel great it did not fix my sex drive. I thought about getting a prescription for Viagra but later found out it does nothing for my arousal. The issue is that I have a very high sex drive (sex is on my mind daily and I want to do it daily) and though we get intimate and I make sure she achieves hers every time, mine remain elusive and I have even had to fake it few times just so I don't hurt her feelings. I have been telling her it's my age and I must be developing ED and that's why I can't maintain my erection. Am I just a shallow AH who desires physical attraction or am I missing something crucial in my relationship. Any advise would be much appreciated because I am at my wits end. Also I apologize for any mistakes I made because English is not my first language. Thank you