Firstly 45 to 70 is a massive span of target audience. They may be web savvy or not so inclined towards online buying (in specific context to India).
Characteristics of a 45 something traveler is: budget is not a issue, planed trip for them is essential.
Content guidelines: site has to be Content rich; location images have to be impressive, feedback of travelers and their recommendations.
Interaction guidelines: commitment and actionable decisions should be aimed,page save/ plan save features, share your travel plan,compare features are suggested.
Characteristics of a 60 to 70 age group:memory can be depleating along with sight, health considerations, food considerations, travel companion considerations.
Content guidelines: Details of stay, parking, availability of lift, room and locations climatic conditions, walking distances and terrain etc.
Interaction guidelines:popular guidelines should be followed(least mental load),reminders and notifications, sharing and saving features, offline downloads are desirable considerations.