Delhi: Senior living options, true costs?

Since last Diwali, I'm looking for a compact flat in Delhi. Kids moved out, don't need such a big place. Apex Sangam Vihar aur Kasturi Homes dono completed hain. Total cost of ownership aur maintenance charges mein bahut fark lag raha hai. Hidden costs kitne honge? Senior citizens ke liye kaunsa better hai, hospital paas mein ho.