Respected user, hi I evaluated your qeury thoroughly .
* Aortic pulse is easily felt when lying down. Location lies near midline 
   between lower edge of ribs & 
umbilicus  vertically  
* Put finger on each side of pulse  with tips 3 cm apart ( as normally 
aorta    is  2 cm wide ) . Wider pulse is possibility of concern & require visit to 
   consultant for evaluation . 
* Thin , lean person this feeling is normal physiologically , in other cases  
   there are possibilities of 
Aortic Aneurysm also .
Hope this  clears your query .
Welcome for any further assistance .
Thanks for using Healthcaremagic.com & giving me an opportunity to assist
Wishing you healthy life ahead .
Regards dear take care .