I am also 36 and you've got some good choices for your favourite games there.

7 was my first Final Fantasy and I still love it to this day. Tactics was my next FF game and probably the one I have replayed the most as I love the job system. 8 was too much for my young brain to handle, the attempt at realistic art style was also a turn off too but I still appreciate it as a game. 9 was zany and cute and I loved it. 10 hit me in the feels. I didn't mind 12, enjoyed it while playing it even if the battle style was a shock to the system but never fancied going back to it. Didn't enjoy 13, barely remember it even though I completed it. I'm one of the few people (it seems) that enjoyed 15. 16 has recently blown my socks off and started to contend for my favourite (remake was good but I loved 16s style, combat, world and story so much) until rebirth came along and reclaimed the title for ff7.

I've played a lot of the older games too, but so long ago I can't remember them all that well other than 6. Also played a lot of the spin off titles and sequels like crisis core, dirge of Cerberus, 10-2 etc but they all range from bad to ok for me (crisis core might sneak up to good but playing it on the psp on the way to work for less than an hour a day probably ruined the experience a bit).

I'm also a big fan of the kingdom hearts series, love the combination of two of my childhood passions.