Is there any facilities for senior citizens in the Shenzhen Window of World?

Yes! You can rent a two-seat scooter. It costs CNY 90 to 120 per hour.

Or, you can charter a battery car. The ones for one to seven persons cost CNY 280 to 350 per hour; for 8 to 12 persons cost CNY 350 to 450 per hour; for 13 to 22 persons cost CNY 780 to 980 per hou; for 23 to 26 persons cost CNY 880 to 1080 per hour. :)