Hi Haissam,
Thank you for contacting Intel Community.
The Cyclone II device family was introduced in 2004. It currently in a mature phase and is NOT recommended for new designs. Although it won't be obsolete within these few years the life cycle is depending on its order volume. You can continue to use it until you received a notification that this particular device part number is going to be discontinued.
You are recommended to subscribe to our customer notification mailing list at the below link so that you can be notified when an Intel FPGA is going to be discontinued.
https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html#pdn
Please do not hesitate to let me know if you need further assistance.
Thank you
Regards,
Chia Ling