You have lived for quite a long time. Your time on the upper planes has left its mark on you, and this might be recognized by certain other creatures. Celestials will react favorably to your presence and will grant you and those you travel with food, water, and/or rest should they have such things available unless you have shown yourself to be a danger to them. 
Fiends on the other hand will consider you a prime target for their schemes and will often act to harm or undermine you if it is in their power to do so without inconveniencing themselves. Though ultimately what the fiend's actions are up to the DM, these acts may be something such as getting you in trouble with the local guards, tampering with your equipment, or feeding you misinformation.