New Delhi: Saif Ali Khan doesn't just turn 56 on August 16, he marks it with an advertising career that's aged as interestingly as his filmography, tracing back to Gwalior Suitings and Limca and now stretching across Linen Club, Dollar Lehar, E3 Group, Sparsh Pearl, Thermocool, and JK Masale. Saif Ali Khan ads and endorsements are truly diverse. His endorsement portfolio is difficult to place within one consumer category. Over the years, Saif A…