liner problems,help!

I have been dealing with a leaky liner the whole month of august,trying everythng,patching holes and slits and small holes as I found them.the liner is 19 years old,we cannot afford a new one,I guess it is a losing battle,I am wondering now if there is mold growing under liner?I notice slight dif in color in liner.just wondering if we can let it sit until spring and hopefully we will be able to afford thn? wht are our options,I feel really sad,feeling we have to give up on our pool at retirement age.our 9 grandchildren love it!help any suggestions.we did not pay for a diver to detect leaks,I don't give up easy,but with being 19 yrs old,feel it wil continue to be a problem!:confused: