They look great to me. As they age you will get leaves dieing off but it didn't mean they're unhealthy. I've got one that's about 8 years old. The leaves have died off the bottom enough that I had to re pot it this year to keep it up right.
I wouldn't worry about the brown spots. The black tips look a little weird to me, I would guess over watering but I really don't know. I only water mine like once a month or so.
Edit: thinking about it, it could be high humidity. I know my green house is to humid for aloe.
They're in a greenhouse. I don't think I'm over watering them. They're getting brown/red on the tips which is one concern. And then those brown spots on them. What's up?
They are new to me. I saw some of these spots when I bought them. Do they heal back?
And sidenote, how long do these bad boys take to reproduce?
