Gratuity Payment Of Long Time Absent Employee

One employee of our organization his running age 59 years is on leave without pay since long time (more than 3 month) he extended his leave 2-3 times. Kindly advice on my following points.
1. Can we terminate his service on ground of his long time leave i.e. LWP while his previous service period is 28 years ?
2. Is he eligible for gratuity for absence period ?
3. Can we write to him to take retirement before his superannuation.
4. What is his right to extend LWP days and how much.
Regards
Rakesh Dubey

1. Can we terminate his service on ground of his long time leave i.e. LWP while his previous service period is 28 years ?
depend on why is he taking leave any why u allowing on which background
2. Is he eligible for gratuity for absence period ?
gratuity need 240 min days in year but you will have to inform him in every quarter that your working days are less and you will not get gratuity for this period
3. Can we write to him to take retirement before his superannuation.
no you cant force him for retirement
4. What is his right to extend LWP days and how much.
depend on company policy