I find Classical lovers find Bach late in life. I think it has to do with the emotionality & maturity found in Bach. Perhaps this is indication Bach really wrote music for heaven. 
I think is true. Bach's work was always a form of prayer.Bach really wrote music for heaven.
Yeah, I agree. In my own case it's Schoenberg, Webern, Stravinsky and others that I've come to appreciate more as I've grown older.I don't know where your generalization comes from. Among musicians Bach's music appeals to all ages, certainly for keyboard players who often encounter his delightful pieces for students early on. Emotionality I associate with Romantic music. Yes, there is John Eliot Gardiner's book about Bach Music in the Castle of Heaven, but as a conductor Gardiner naturally gravitates towards Bach's choral music.
Now that I can't decipher.It lacks the style of folks like Stravinsky and Debussy
All music contains "structured patterns and rhythms". That's a bit like saying, one likes Shakespeare because his plays are made out of words and verses...Perhaps my profession (programming + software engineering) has something to do with how my brain works and the music it likes? Strucrtured patterns and rhthms, not sure where I'm going with this.
I may be true if you are referring to audiences not musicians. And it would be interesting to know whether the same is true for any other major composer, for example Handel.I'm just noticing a trend that older folks tend to appreciate his work more than younger crowds.
This is not my experience. Bach's music was second for me, right after Beethoven that I discovered in my teens.
I have only gotten more deeply into it as I have aged into my 60s.
I have a "friend" who adored Bach in his 20s. The last time I saw him, I asked about his love of Bach. He said he didn't listen to Bach much any more. He found him too simple. Now, he said he adores Mozart.
(As I've aged, I find I cannot stand most of Mozart's music. I used to find it lovely and abstractly interesting, but not particularly deep. Now it all seems too light, too flimsy, too facile, too Rococo, too contrived, too speciously lovely, and full of too much aristocratic foppishnesss. As someone said earlier, too much foolishness. Perhaps ironically, I really like Haydn.)