Is it illegal for a 24 year old to date a 44 year old?

Its not illegal but the younger partner has got to be mature. Relationships are nothing to play with. If you get married, the Bible says until death, in sickness, poor, etc. You have to really be in love. Health issues could but not necessarily slow the older partner down. Both have to love each other enough to stick together through all of this tribulation. Read the Bible together. It will help.