BROOKLYN - The city's MetroCard turned 20 years old this week, but it's future days could be numbered.

The MTA announced that it will seek out proposals later this year to create a new payment system for riding the subways and buses.

Transportation officials haven't released many details, but say that customers will likely be able to use their smartphones to pay for fares, or possibly use bank tap-and-go smart cards.

A new system isn't expected to take over the MetroCard until at least 2019.