I started with FFTA for the GBA at around age 11/12...then got FF1/FF2 pack, FF4, FF5, and FF6. Also FFT and FFTA2. Finished them all, enjoyed 5 the most for the 'best' class system.
Heard FF7 is overrated, ignored FF8/9, enjoyed FFX and X2, ingored the online one, got FF12, got bored, not...