I am 48. I am 240 lbs. I have never had a butt, just a crack. Skinny legs and big jelly stomach. Am i eligible for a BBL?

Hello dear!!
Thanks for the question and provided information as well.
Unfortunately, without pictures, it is very difficult to give you a proper answer.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 30 or less. l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

Most PS have a BMI cut off for safety. For a BBL mine is 35. For other doctors it may be a 32. This is because your risk of complications such as infection greatly increases when your BMI is greater than 32. Also the aesthetic results may be compromised since there are max amounts we are "allowed" to take off of a patient (this varies state to state). Here in TX it is 5L of lipoaspirate. You should find a board certified PS in your area and have a formal consultation.