The IT industry is a very fast changing environment and there are new languages being invented, new technologies being uncovered and new methodologies being proposed. At the same time there are better equipped smarter and more enthusiastic youngsters that are passing out of university all excited to be part of the world building the next exciting thing to hit the technology market.
Given this situation its quite a challenge for someone who has already been working in the industry for sometime to continue to stay relevant and know and understand all the time what is happening and at the same time being acquainted with the technology and the tools that the people are using and the customers are demanding.
But it is important that one does stay acquainted and relevant to the changing times. If you don't then there is every chance that one can get rolled over by either the technology or by the super smart young kids coming out of university.
Learning never ceases and if you stop learning that would be the start of your decline. There is no reason now to stop learning in this age of online courses (coursera, udemy, many more), YouTube and many more platforms.
Keep Learning. Stay Relevant.