Q How do I deal with a younger co-worker who is better at our job than I am? He has much more knowledge about the technical side of our work and I feel worried about my job security.
A Your co-worker isn't the main issue; the big question is how you cope in an ever-changing work environment.
The inner game
Evaluate the situation and your responses. Your practical concern is job security. What's underneath? Jealousy? Anger? Maybe a sense that you'll be passed over for promotion? Identify your emotions so that they don't pop out in destructive ways.
Be realistic about the relationship, too. You could be allies or adversaries, so think carefully about ways that you could help or hurt each other.
Do an inventory. Assess your technical skills, as well as other characteristics you possess. Your work experience has doubtless given you a valuable set of leadership and interpersonal skills. Think about factors that may be holding you back, and consider ways to address them.
Know what you want. Consider your direction for the next five to 10 years. If you prefer to be a technical expert, then focus on ongoing training and skill development. If you see yourself in a leadership role, you'll design a different plan. In any case, job security -- any type of ongoing success -- will require continuous learning.
Identify your options. Many companies provide funding for training, but also think about how much time and money you're willing to personally invest.