Everyone loves a good viral app, and this one is making the rounds: Microsoft's 'How Old Do I Look' app. The software giant's latest analysis tool How-Old.net lets you upload a photo and analyzes how old you look. Here's how old it thought some Marvel characters were:

1. Steve Rogers

2. Tony Stark

3. Bruce Banner

4. Natalia “Natasha” Romanova

5. Thor

6. Clint Barton

7. Quicksilver

8. Scarlet Witch

9. Sam Wilson

10. Agent Coulson

11. Agent Maria Hill

12. Loki

13. Virginia “Pepper” Potts

14. Jane Foster

15. Erik Selvig

16. Nick Fury

17. Bucky Barnes

18. Ultron