Only 0.9m and need a ticket?

Something which I saw, last time at the gantry of the lrt/mrt, they will put up a notice/stand saying something like, "If you are above 0.9m, you need to purchase a ticket." I never really bother with it until I had Chloe. Chloe is now standing at 0.9m tall and I find that it's ridiculous for me to purchase a ticket for her since she's only 2yrs old. Anyway recently I noticed they changed their notice/stand. "If you are above 0.9m and above 7yrs old, you need to purchase a ticket." Hope I'm seeing the right thing.