Mac, can I ask you to ask yourself a pertinent question? You don't have to post the answer here, but if you do it will help us to understand your situation a little better.

Why are you messaging women in 35-50 age bracket when you are in your 60s? What are the reasons behind this?

Some thoughts:

You state age doesn't matter, but why then are you not messaging women 10-20 years older than yourself?

You have stated several times you are feeling intimidated by the whole dating process (I completely sympathise with this btw), are you perhaps deliberately sabotaging your chances of success by setting unrealistic targets? This may sound crazy, but some of us possess an amazing ability to self-sabotage without realising it (myself included, just not in the area of romance).

I'd urge you to think about this carefully, it may well lead to a better self-awareness and understanding of what your needs really are and how best to address them.