Toilet leakage problem

Q: There was leakage in the washroom ceiling and then it stopped by itself. There is a washroom on the top floor. The water from the leakage has dried now. If somebody uses the washroom and wet feet touch floor and they walk around the house will the house be impure. The floor was not washed after the leakage water dried. Is whole house impure and I can't pray there?

Wearing purdah

Q: Is there a specified age for a female to wear purdah? Is it ok for a female at the age of 50 to start doning the niqaab. What are the stipulated laws and requirements necessary to adhere and heed to when one is in niqaab? Did she sin for all the years by not wearing purdah even though she always wore hijaab. If it was a sin not wearing purdah how does she compensate for the sin? Is it permissible for a female in purdah to use public transport? Is it permissible for a female in purdah to walk on a public road. Does she have to wear gloves? I will be extremely grateful for your help as it is of profound importance.