I too am in my 40s and I think that my creativity is still active. The main difference is now I have the experience to know when an idea is worth acting on and when it is just an "wow, wouldn't that be great."<p>Even if something would be great, that does not mean that an idea that you have is one that ignites your passion. If you are not passionate about an idea it is not an idea that you should pursue, at least not as a founder, inventor, etc.<p>I think creativity is simply the way you think. For me, when I see something that I like I always ask myself several questions such as :<p>1. I wonder why ......
2. What would be the outcome of ....
3. What if.....
4. Wouldn't it be/function/look/inspire if
5. How can I make this.....<p>These are not the only questions I ask, but if the answers keep me excited about something, I continue asking myself questions to see if the resulting answers create something worthy of further pursuit. If so, then I approach a couple of trusted people and ask them 'what if this did this or if you had this available to you' would you use it? Would you use it often? Would you tell others about it? What would make it better' etc. If you are lucky an idea or two or five are worth putting all of your energy behind. I have felt that way about a couple of ideas in my life but they did not always come at times that my life allowed me to pursue the idea with all my time and attention, until now. I liken it to finding your significant other, they have to challenge you, ignite your passion and the timing has to be right.<p>But overall, I believe that Creativity is not about age as much as it is developing your own way of seeing things and then arriving at something new. Not everybody questions most things they see, hear, touch, etc but for those of us that do, well age is just a number.